http://www.cnr.it/ontology/cnr/individuo/prodotto/ID2845

Quantized vortices in an exciton-polariton condensate (Articolo in rivista)

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Quantized vortices in an exciton-polariton condensate (Articolo in rivista) (literal)

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Lagoudakis, KG; Wouters, M; Richard, M; Baas, A; Carusotto, I; Andre, R; Dang, LESI; Deveaud-Pledran, B (2008)
Quantized vortices in an exciton-polariton condensate
in Nature physics (Print)
(literal)

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Lagoudakis, KG; Wouters, M; Richard, M; Baas, A; Carusotto, I; Andre, R; Dang, LESI; Deveaud-Pledran, B (literal)

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\"[Lagoudakis, K. G.; Richard, M.; Baas, A.; Deveaud-Pledran, B.] Ecole Polytech Fed Lausanne, IPEQ, CH-1015 Lausanne, Switzerland; [Wouters, M.] Ecole Polytech Fed Lausanne, ITP, CH-1015 Lausanne, Switzerland; [Carusotto, I.] Univ Trent, INFM, CNR, BEC, I-38050 Trento, Italy; [Carusotto, I.] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; [Andre, R.; Dang, L. E. S. I.] CNRS, Inst Neel, F-38042 Grenoble, France (literal)

Titolo

Abstract

One of the most striking quantum effects in an interacting Bose gas at low temperature is superfluidity. First observed in liquid He-4, this phenomenon has been intensively studied in a variety of systems for its remarkable features such as the persistence of superflows and the proliferation of quantized vortices(1). The achievement of Bose-Einstein condensation in dilute atomic gases(2) provided the opportunity to observe and study superfluidity in an extremely clean and well-controlled environment. In the solid state, Bose-Einstein condensation of exciton polaritons has been reported recently(3-6). Polaritons are strongly interacting light-matter quasiparticles that occur naturally in semiconductor microcavities in the strong-coupling regime and constitute an interesting example of composite bosons. Here, we report the observation of spontaneous formation of pinned quantized vortices in the Bose-condensed phase of a polariton fluid. Theoretical insight into the possible origin of such vortices is presented in terms of a generalized Gross-Pitaevskii equation. Whereas the observation of quantized vortices is, in itself, not sufficient for establishing the superfluid nature of the non-equilibrium polariton condensate, it suggests parallels between our system and conventional superfluids. (literal)

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